Alexandria, Egypt

(1:05 p.m. EDT) -- Fred. Olsen Cruise Lines has cancelled a call to the port of Alexandria in Egypt today, following a terrorist attack that took place in the city on April 9.

Fred. Olsen's 804-passenger Black Watch -- which is currently on a world cruise -- also made adjustments to its itinerary over the weekend, replacing Safaga with Sharm el-Sheikh before switching Alexandria with a call to Heraklion, Crete, today.

Changes to the ship's itinerary follow two explosions that occurred over the weekend -- one in Mar Girgis church in Tanta and the other in St Mark's Cathedral in Alexandria -- killing 44 people.

As a result of the attacks, the Egyptian president, Abdel Fatah al-Sisi, announced a three-month state of emergency in the country.

In a statement, Fred. Olsen said: "To ensure the safety and security of Fred. Olsen Cruise Lines' guests and crew, Safaga replaced Sharm el-Sheikh on Black Watch's Around the World cruise itinerary last week, and the ship is calling at Heraklion, Crete, today, in place of Alexandria.

"We will continue to monitor the situation in Egypt closely and will act in accordance with guidelines from the Foreign and Commonwealth Office and other relevant agencies to ensure that our guests and crew are kept as safe and secure as possible at all times."

The Foreign & Commonwealth Office currently advises against travel to North Sinai and advises against all but essential travel to South Sinai, with the exception of the area within the Sharm el Sheikh perimeter barrier.

The FCO website advises travelers to " remain vigilant at all times and follow the advice of local security officials, including in and around religious sites and during religious festivals.

"The Israeli authorities have warned of an increased possibility of terrorist attacks in South Sinai, especially during the Passover festival (which in 2017 runs from 10 to 18 April). You should be especially vigilant during this period."

Other lines due to call on Egyptian ports in the coming days include Silversea, P&O Cruises, Oceania Cruises, Regent Seven Seas and Cruise & Maritime Voyages.

Cruise Critic is in contact with these cruise lines and will update this story if further itinerary changes occur.

--By Kerry Spencer, Editor, U.K.